I've bought from Rodent Pro in the past and my biggest complaint with them was sometimes my rats would be missing limbs that broke off while frozen. As for the disease problem they had, it's my understanding that it only affected their mice and they have taken care of the problem. Problems like that can spring up with any rodent breeder as large as Rodent Pro.
Given how they didn't disclose the information to any of their clients until one blew the whistle I will be trying MiceDirect with my next rat order in a week or two.